John Grocott, Michael Brown, R.David Dallmeyer, Graeme K. Taylor, Peter J. Treloar; Mechanisms of continental growth in extensional arcs: An example from the Andean plate-boundary zone. Geology ; 22 (5): 391–394. doi: https://doi.org/10.1130/0091-7613(1994)022<0391:MOCGIE>2.3.CO;2
Download citation file:
During the Late Triassic, Jurassic, and Early Cretaceous, an extensional magmatic arc was formed in the Andean margin of northern Chile. Plutons emplaced at ramps within a hinterland-propagating extensional duplex were fed by dikes that transferred magma through the lower crust from a reservoir in the mantle Phases of volcanism separated phases of plutonism, and our model demonstrates that plutonism was favored only when upper-plate extensional fault systems were active. When they were not, dikes cut across inactive faults, and magma rose directly to the surface during volcanic phases of arc growth.